feat: implement period-over-period comparison in Ads tab

- AdsPerformance.tsx: Automatically activate comparison view when 2 periods are selected
- AdsPerformance.tsx: Add growth percentages and trend indicators to table and summary
- AdsPerformance.tsx: Implement chronological sorting for previous vs current periods
- App.tsx: Pass filters to AdsPerformance component

App.tsx

@@ -493,7 +493,7 @@ const App: React.FC = () => {
                 {view === 'table' && <DataGrid data={combinedAdsData} hasCustomerFilter={filters.customer.length > 0} adsData={filteredAdsData} />}
                 {view === 'weekly' && <WeeklyGrid data={combinedAdsData} top50Ranking={top50Ranking2025} />}
                 {view === 'movers' && <TopMovers data={filteredData} />}
-                {view === 'ads' && <AdsPerformance data={combinedAdsData} />}
+                {view === 'ads' && <AdsPerformance data={combinedAdsData} filters={filters} />}
               </Suspense>
             </div>
           </>

components/AdsPerformance.tsx

@@ -1,65 +1,110 @@
 import React, { useMemo, useState } from 'react';
-import { CombinedKPIs } from '../types';
+import { CombinedKPIs, FilterState } from '../types';
 
 interface AdsPerformanceProps {
     data: CombinedKPIs[];
+    filters: FilterState;
 }
 
 type SortKey = keyof CombinedKPIs | 'acos' | 'roas' | 'tacos' | 'ctr' | 'cpc' | 'cvrUnits';
 
-const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
+const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data, filters }) => {
     const [searchTerm, setSearchTerm] = useState('');
     const [sortConfig, setSortConfig] = useState<{ key: SortKey; direction: 'asc' | 'desc' }>({
         key: 'cost',
         direction: 'desc'
     });
 
-    // 1. Aggregate data by ASIN
+    // Detect comparison mode: exactly 2 weeks, 2 months, or 2 years
+    const comparisonConfig = useMemo(() => {
+        let periods: string[] = [];
+        let type: 'week' | 'month' | 'year' | null = null;
+
+        if (filters.week.length === 2) {
+            periods = [...filters.week].sort((a, b) => {
+                const wA = parseInt(a.replace('W', ''));
+                const wB = parseInt(b.replace('W', ''));
+                return wA - wB;
+            });
+            type = 'week';
+        } else if (filters.month.length === 2) {
+            // Simple sort for abbreviated months might be tricky without year, 
+            // but usually users pick consecutive ones.
+            periods = [...filters.month];
+            type = 'month';
+        } else if (filters.year.length === 2) {
+            periods = [...filters.year].sort();
+            type = 'year';
+        }
+
+        if (type && periods.length === 2) {
+            return { type, prev: periods[0], curr: periods[1] };
+        }
+        return null;
+    }, [filters]);
+
+    // 1. Aggregate and Compare data by ASIN
     const aggregatedByAsin = useMemo(() => {
-        const map = new Map<string, CombinedKPIs>();
+        const map = new Map<string, { curr: CombinedKPIs; prev?: CombinedKPIs }>();
 
         data.forEach(item => {
             const asin = item.asin.trim().toUpperCase();
+            const periodVal = comparisonConfig?.type === 'week' ? `W${item.week}` :
+                comparisonConfig?.type === 'month' ? item.month :
+                    comparisonConfig?.type === 'year' ? item.year.toString() : null;
+
+            const isCurrent = !comparisonConfig || periodVal === comparisonConfig.curr;
+            const isPrevious = comparisonConfig && periodVal === comparisonConfig.prev;
+
             if (!map.has(asin)) {
-                map.set(asin, { ...item });
+                // Initialize with empty record if it's new
+                const defaultRec: CombinedKPIs = { ...item, salesTotal: 0, unitsTotal: 0, salesAds: 0, unitsAds: 0, cost: 0, clicks: 0, impressions: 0, conversions: 0, salesOrganic: 0 };
+                map.set(asin, {
+                    curr: isCurrent ? { ...item } : { ...defaultRec },
+                    prev: isPrevious ? { ...item } : undefined
+                });
             } else {
-                const existing = map.get(asin)!;
-                existing.salesTotal += item.salesTotal;
-                existing.unitsTotal += item.unitsTotal;
-                existing.salesAds += item.salesAds;
-                existing.unitsAds += item.unitsAds;
-                existing.cost += item.cost;
-                existing.clicks += item.clicks;
-                existing.impressions += item.impressions;
-                existing.conversions += item.conversions;
-                existing.salesOrganic += item.salesOrganic;
+                const entry = map.get(asin)!;
+                const target = isCurrent ? entry.curr : (isPrevious ? (entry.prev || (entry.prev = { ...item, salesTotal: 0, unitsTotal: 0, salesAds: 0, unitsAds: 0, cost: 0, clicks: 0, impressions: 0, conversions: 0, salesOrganic: 0 })) : null);
+
+                if (target) {
+                    target.salesTotal += item.salesTotal;
+                    target.unitsTotal += item.unitsTotal;
+                    target.salesAds += item.salesAds;
+                    target.unitsAds += item.unitsAds;
+                    target.cost += item.cost;
+                    target.clicks += item.clicks;
+                    target.impressions += item.impressions;
+                    target.conversions += item.conversions;
+                    target.salesOrganic += item.salesOrganic;
+                }
             }
         });
 
-        return Array.from(map.values()).map(item => {
-            // Recalculate derived metrics for the aggregate
-            const salesTotal = item.salesTotal;
-            const adSales = item.salesAds;
-            const adCost = item.cost;
-            const adClicks = item.clicks;
-            const adImpressions = item.impressions;
-            const adConversions = item.conversions;
+        return Array.from(map.values()).map(({ curr, prev }) => {
+            const calcMetrics = (item: CombinedKPIs) => ({
+                ...item,
+                acos: item.salesAds > 0 ? (item.cost / item.salesAds) * 100 : 0,
+                tacos: item.salesTotal > 0 ? (item.cost / item.salesTotal) * 100 : 0,
+                roas: item.cost > 0 ? item.salesAds / item.cost : 0,
+                ctr: item.impressions > 0 ? (item.clicks / item.impressions) * 100 : 0,
+                cpc: item.clicks > 0 ? item.cost / item.clicks : 0,
+                cvrUnits: item.clicks > 0 ? (item.conversions / item.clicks) * 100 : 0,
+            });
+
+            const currFinal = calcMetrics(curr);
+            const prevFinal = prev ? calcMetrics(prev) : undefined;
 
             return {
-                ...item,
-                acos: adSales > 0 ? (adCost / adSales) * 100 : 0,
-                tacos: salesTotal > 0 ? (adCost / salesTotal) * 100 : 0,
-                roas: adCost > 0 ? adSales / adCost : 0,
-                ctr: adImpressions > 0 ? (adClicks / adImpressions) * 100 : 0,
-                cpc: adClicks > 0 ? adCost / adClicks : 0,
-                cvrUnits: adClicks > 0 ? (adConversions / adClicks) * 100 : 0,
+                ...currFinal,
+                prevData: prevFinal
             };
         });
-    }, [data]);
+    }, [data, comparisonConfig]);
 
-    // 2. Global Totals for Summary Header
+    // 2. Global Totals
     const totals = useMemo(() => {
-        return aggregatedByAsin.reduce((acc, curr) => ({
+        const sum = (items: any[]) => items.reduce((acc, curr) => ({
             salesTotal: acc.salesTotal + curr.salesTotal,
             salesAds: acc.salesAds + curr.salesAds,
             salesOrganic: acc.salesOrganic + curr.salesOrganic,
@@ -67,25 +112,25 @@ const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
             impressions: acc.impressions + curr.impressions,
             clicks: acc.clicks + curr.clicks,
             conversions: acc.conversions + curr.conversions,
-        }), {
-            salesTotal: 0,
-            salesAds: 0,
-            salesOrganic: 0,
-            cost: 0,
-            impressions: 0,
-            clicks: 0,
-            conversions: 0,
-        });
-    }, [aggregatedByAsin]);
+        }), { salesTotal: 0, salesAds: 0, salesOrganic: 0, cost: 0, impressions: 0, clicks: 0, conversions: 0 });
 
-    const globalMetrics = {
-        acos: totals.salesAds > 0 ? (totals.cost / totals.salesAds) * 100 : 0,
-        tacos: totals.salesTotal > 0 ? (totals.cost / totals.salesTotal) * 100 : 0,
-        roas: totals.cost > 0 ? totals.salesAds / totals.cost : 0,
-        ctr: totals.impressions > 0 ? (totals.clicks / totals.impressions) * 100 : 0,
-        cpc: totals.clicks > 0 ? totals.cost / totals.clicks : 0,
-        cvr: totals.clicks > 0 ? (totals.conversions / totals.clicks) * 100 : 0,
-    };
+        const currTotals = sum(aggregatedByAsin);
+        const prevTotals = comparisonConfig ? sum(aggregatedByAsin.map(a => a.prevData).filter(Boolean)) : null;
+
+        return { curr: currTotals, prev: prevTotals };
+    }, [aggregatedByAsin, comparisonConfig]);
+
+    const calculateDerived = (t: any) => ({
+        acos: t.salesAds > 0 ? (t.cost / t.salesAds) * 100 : 0,
+        tacos: t.salesTotal > 0 ? (t.cost / t.salesTotal) * 100 : 0,
+        roas: t.cost > 0 ? t.salesAds / t.cost : 0,
+        ctr: t.impressions > 0 ? (t.clicks / t.impressions) * 100 : 0,
+        cpc: t.clicks > 0 ? t.cost / t.clicks : 0,
+        cvr: t.clicks > 0 ? (t.conversions / t.clicks) * 100 : 0,
+    });
+
+    const currMetrics = calculateDerived(totals.curr);
+    const prevMetrics = totals.prev ? calculateDerived(totals.prev) : null;
 
     // 3. Filter and Sort
     const filteredAndSorted = useMemo(() => {
@@ -128,26 +173,29 @@ const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
                     <h1 className="text-2xl font-bold text-white mb-1">Performance Overview</h1>
                     <div className="flex items-center gap-2 text-xs text-slate-500">
                         <span className="w-2 h-2 rounded-full bg-emerald-500"></span>
-                        <span>{aggregatedByAsin.length} records processed • All • All Years</span>
+                        <span>
+                            {aggregatedByAsin.length} products •
+                            {comparisonConfig ? ` Comparison: ${comparisonConfig.prev} vs ${comparisonConfig.curr}` : ' Direct Overview'}
+                        </span>
                     </div>
                 </div>
             </div>
 
             {/* Summary Grid */}
             <div className="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-7 xl:grid-cols-13 gap-4 bg-[#141820] p-4 rounded-xl border border-white/5 shadow-xl">
-                <SummaryCard label="TOTAL SALES" value={formatCurrency(totals.salesTotal)} color="text-emerald-400" />
-                <SummaryCard label="ADS SALES" value={formatCurrency(totals.salesAds)} color="text-orange-400" />
-                <SummaryCard label="ORGANIC SALES" value={formatCurrency(totals.salesOrganic)} color="text-blue-400" />
-                <SummaryCard label="AD SPEND" value={formatCurrency(totals.cost)} color="text-indigo-400" />
-                <SummaryCard label="IMPR." value={formatNumber(totals.impressions)} />
-                <SummaryCard label="CLICKS" value={formatNumber(totals.clicks)} />
-                <SummaryCard label="ADS ORDERS" value={formatNumber(totals.conversions)} />
-                <SummaryCard label="CPC" value={`$${globalMetrics.cpc.toFixed(2)}`} />
-                <SummaryCard label="CTR" value={formatPercent(globalMetrics.ctr)} />
-                <SummaryCard label="CVR" value={formatPercent(globalMetrics.cvr)} />
-                <SummaryCard label="ACOS" value={formatPercent(globalMetrics.acos)} />
-                <SummaryCard label="ROAS" value={globalMetrics.roas.toFixed(2)} color="text-blue-300" />
-                <SummaryCard label="TACOS" value={formatPercent(globalMetrics.tacos)} />
+                <SummaryCard label="TOTAL SALES" value={formatCurrency(totals.curr.salesTotal)} prevValue={totals.prev?.salesTotal} color="text-emerald-400" />
+                <SummaryCard label="ADS SALES" value={formatCurrency(totals.curr.salesAds)} prevValue={totals.prev?.salesAds} color="text-orange-400" />
+                <SummaryCard label="ORGANIC SALES" value={formatCurrency(totals.curr.salesOrganic)} prevValue={totals.prev?.salesOrganic} color="text-blue-400" />
+                <SummaryCard label="AD SPEND" value={formatCurrency(totals.curr.cost)} prevValue={totals.prev?.cost} color="text-indigo-400" />
+                <SummaryCard label="IMPR." value={formatNumber(totals.curr.impressions)} prevValue={totals.prev?.impressions} />
+                <SummaryCard label="CLICKS" value={formatNumber(totals.curr.clicks)} prevValue={totals.prev?.clicks} />
+                <SummaryCard label="ADS ORDERS" value={formatNumber(totals.curr.conversions)} prevValue={totals.prev?.conversions} />
+                <SummaryCard label="CPC" value={`$${currMetrics.cpc.toFixed(2)}`} prevValue={prevMetrics?.cpc} inverse />
+                <SummaryCard label="CTR" value={formatPercent(currMetrics.ctr)} prevValue={prevMetrics?.ctr} />
+                <SummaryCard label="CVR" value={formatPercent(currMetrics.cvr)} prevValue={prevMetrics?.cvr} />
+                <SummaryCard label="ACOS" value={formatPercent(currMetrics.acos)} prevValue={prevMetrics?.acos} inverse />
+                <SummaryCard label="ROAS" value={currMetrics.roas.toFixed(2)} prevValue={prevMetrics?.roas} color="text-blue-300" />
+                <SummaryCard label="TACOS" value={formatPercent(currMetrics.tacos)} prevValue={prevMetrics?.tacos} inverse />
             </div>
 
             {/* Table Section */}
@@ -155,7 +203,9 @@ const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
                 <div className="p-4 border-b border-white/5 flex justify-between items-center bg-[#1A1F29]">
                     <div>
                         <h2 className="text-sm font-bold text-white uppercase tracking-wider">Product Inventory</h2>
-                        <p className="text-[10px] text-slate-500 mt-0.5">Displaying total accumulated data for selected filters.</p>
+                        <p className="text-[10px] text-slate-500 mt-0.5">
+                            {comparisonConfig ? `Comparing ${comparisonConfig.curr} vs ${comparisonConfig.prev}` : 'Displaying total data for selected filters.'}
+                        </p>
                     </div>
                     <div className="flex items-center gap-4">
                         <input
@@ -189,7 +239,7 @@ const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
                             </tr>
                         </thead>
                         <tbody className="divide-y divide-white/[0.03]">
-                            {filteredAndSorted.map((row) => (
+                            {filteredAndSorted.map((row: any) => (
                                 <tr key={row.id} className="hover:bg-white/[0.02] transition-colors group">
                                     <td className="p-4 py-3">
                                         <div className="flex flex-col gap-0.5">
@@ -198,19 +248,19 @@ const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
                                             <span className="text-[10px] text-slate-500 truncate max-w-[220px] leading-tight" title={row.title}>{row.title}</span>
                                         </div>
                                     </td>
-                                    <td className="p-4 text-right font-bold text-white">{formatNumber(row.salesTotal)}</td>
-                                    <td className="p-4 text-right font-bold text-white">{formatNumber(row.salesAds)}</td>
-                                    <td className="p-4 text-right font-bold text-white">{formatNumber(row.salesOrganic)}</td>
-                                    <td className="p-4 text-right font-bold text-white">{formatNumber(row.cost)}</td>
-                                    <td className="p-4 text-right text-slate-400">{formatNumber(row.impressions)}</td>
-                                    <td className="p-4 text-right text-slate-400">{formatNumber(row.clicks)}</td>
-                                    <td className="p-4 text-right text-slate-400">{formatNumber(row.conversions)}</td>
-                                    <td className="p-4 text-right text-slate-400">${row.cpc.toFixed(2)}</td>
-                                    <td className="p-4 text-right text-slate-400">{row.ctr.toFixed(2)}%</td>
-                                    <td className="p-4 text-right text-slate-400">{row.cvrUnits.toFixed(2)}%</td>
-                                    <td className="p-4 text-right text-slate-400">{row.acos.toFixed(2)}%</td>
-                                    <td className="p-4 text-right font-bold text-blue-300">{row.roas.toFixed(2)}</td>
-                                    <td className="p-4 text-right text-slate-400">{row.tacos.toFixed(2)}%</td>
+                                    <TableCell value={row.salesTotal} prevValue={row.prevData?.salesTotal} format="currency" />
+                                    <TableCell value={row.salesAds} prevValue={row.prevData?.salesAds} format="currency" />
+                                    <TableCell value={row.salesOrganic} prevValue={row.prevData?.salesOrganic} format="currency" />
+                                    <TableCell value={row.cost} prevValue={row.prevData?.cost} format="currency" />
+                                    <TableCell value={row.impressions} prevValue={row.prevData?.impressions} format="number" />
+                                    <TableCell value={row.clicks} prevValue={row.prevData?.clicks} format="number" />
+                                    <TableCell value={row.conversions} prevValue={row.prevData?.conversions} format="number" />
+                                    <TableCell value={row.cpc} prevValue={row.prevData?.cpc} format="number" prefix="$" inverse />
+                                    <TableCell value={row.ctr} prevValue={row.prevData?.ctr} format="percent" />
+                                    <TableCell value={row.cvrUnits} prevValue={row.prevData?.cvrUnits} format="percent" />
+                                    <TableCell value={row.acos} prevValue={row.prevData?.acos} format="percent" inverse />
+                                    <TableCell value={row.roas} prevValue={row.prevData?.roas} format="number" highlight />
+                                    <TableCell value={row.tacos} prevValue={row.prevData?.tacos} format="percent" inverse />
                                 </tr>
                             ))}
                         </tbody>
@@ -221,12 +271,47 @@ const AdsPerformance: React.FC<AdsPerformanceProps> = ({ data }) => {
     );
 };
 
-const SummaryCard = ({ label, value, color = "text-white" }: { label: string; value: string; color?: string }) => (
-    <div className="flex flex-col items-center justify-center p-2 border-r last:border-r-0 border-white/5 w-full min-w-[80px]">
-        <span className={`${color} text-[10px] font-black tracking-widest mb-1 text-center leading-tight`}>{label}</span>
-        <span className="text-sm font-bold text-white">{value}</span>
-    </div>
-);
+const SummaryCard = ({ label, value, prevValue, color = "text-white", inverse = false }: { label: string; value: string; prevValue?: number; color?: string; inverse?: boolean }) => {
+    const growth = prevValue !== undefined && prevValue > 0
+        ? ((parseFloat(value.replace(/[^0-9.-]+/g, "")) - prevValue) / prevValue) * 100
+        : null;
+
+    return (
+        <div className="flex flex-col items-center justify-center p-2 border-r last:border-r-0 border-white/5 w-full min-w-[80px]">
+            <span className={`${color} text-[10px] font-black tracking-widest mb-1 text-center leading-tight uppercase`}>{label}</span>
+            <div className="flex flex-col items-center">
+                <span className="text-sm font-bold text-white transition-all">{value}</span>
+                {growth !== null && (
+                    <span className={`text-[9px] font-bold mt-0.5 ${(growth > 0 ? !inverse : inverse) ? 'text-emerald-400' : 'text-rose-500'}`}>
+                        {growth > 0 ? '↑' : '↓'} {Math.abs(growth).toFixed(1)}%
+                    </span>
+                )}
+            </div>
+        </div>
+    );
+};
+
+const TableCell = ({ value, prevValue, format, prefix = "", inverse = false, highlight = false }: { value: number; prevValue?: number; format: 'currency' | 'number' | 'percent'; prefix?: string; inverse?: boolean; highlight?: boolean }) => {
+    const growth = prevValue !== undefined && prevValue > 0 ? ((value - prevValue) / prevValue) * 100 : null;
+
+    let displayValue = "";
+    if (format === 'currency') displayValue = new Intl.NumberFormat('en-US').format(value);
+    else if (format === 'number') displayValue = prefix + value.toFixed(format === 'number' && prefix === "$" ? 2 : 0);
+    else if (format === 'percent') displayValue = value.toFixed(2) + "%";
+
+    return (
+        <td className="p-4 text-right">
+            <div className="flex flex-col items-end">
+                <span className={`font-bold ${highlight ? 'text-blue-300' : 'text-white'}`}>{displayValue}</span>
+                {growth !== null && (
+                    <span className={`text-[9px] font-medium ${(growth > 0 ? !inverse : inverse) ? 'text-emerald-400' : 'text-rose-400'} opacity-80`}>
+                        {growth > 0 ? '+' : ''}{growth.toFixed(1)}%
+                    </span>
+                )}
+            </div>
+        </td>
+    );
+}
 
 const SortableHeader = ({ label, sortKey, activeSort, onSort }: {
     label: string;